Automatic timing mechanism for magnetos.



H. DIEHL.

AUTOMATIC [IMING MECHANISM FOR MAGNEIOS. APPLICATION FILED NOV. 9, 1911. RENEWED DEC. 10. 1911.

1,273,044. Patented July 16,1918.

Fig.1

STATES PATENT OFFICE.

HERMANN DIEHL, OF FRANKFORT-ON-TEE-MAIN-BOCKENHEIM, GERMANY, ASSIGN'OE TO THE FIRM F MAFAM MOTOEAPPARATE G. M. B. H., 01 FBANKFOBT-ON-THE- MAIN, GERMANY.

. AUTOMATIC TIMING MECHANISM FOR MAGNETOS.

Specification of Letters Patent.

Patented July 16, 1918.

Application filed November 9, 1911, Serial No. 659,312. Renewed December 10, 1917. Serial No. 206,546.

To all whom it may concern Be it known that I, HERMANN DIEHL, a

a citizen of the German Empire, residing at Frankfort-on-the-Main-Bockenheim, in the- Kingdom of Prussia, Province of Hesse-Nassau, Germany, have invented certain new and useful Improvements in Automatic Tim- I ing Mechanism for Magnetos, of which the following is a specification.

This invention relates to improved means for use in automatically regulating the timing in magneto-ignition apparatus, such as commonly'employed in connection with internal combustion engines. Such timing is dependent upon the angular position ofthe magneto-shaft, whereon the armature is mounted, in relation to that of the motor-shaft, or shaft driven therefrom; and many attempts have been made to vary such angular position automatically upon a change occurring in the speed of the engine.

The majority of the devices hitherto proposed present, however, the disadvantage that, when arranged inside a casing, they entail structural modifications in the magneto, and in other instances where such modifications are not entailed, modifications in the motor casing become necessary.

It has also been proposed to arrange the regulating device as a coupling between the free end of the motor-shaft and that of the magneto-shaft, that is to say, on the end of one shaft centrifugal bodies are pivotally mounted, and, by means oflevers, toothgearing-or the like, engage with corresponding parts connected to the end of the other shaft. I

Constructions of this character have the defect that, owing to themanner in which the coupling parts engage the shafts, great accuracy as regards axial alinemen't is necessary; and they require moreover readjustment whenever the magneto has been removed. As the space in the magneto is very restricted, this operation isusually attended with considerable difliculty. -The space occupied in a longitudinal direction constitutes another disadvantage.

The object of thepresent invention is'to provide an apparatus capable of being fitted to the motor-shaft or the magneto-shaft of any make, and even of being readily adapted to any existing machine; the construction being such that the restricted space available in a longitudinal direction is notseriously encroached upon. p f

This effect can only. be achieved 'by constructing the regulating device as an independent and selfcontained apparatus, wherein the working parts are inclosed and wherein the parts which-engage together and are turned relatively to each other are invariably pivoted one inanother, so that the timing regulator may be made ready for use and inserted in any machine without requiring the operative parts to be readjusted. In such cases it is suflicient to mount the apparatus concentrically in relation either to the end of the motor driven shaft or to the magneto shaft.

In the accompanying drawings, wherein is illustrated the apparatus mounted in the manner last referred to, Figure 1 is a side elevation of a magneto embodying my im proved tnnlng regulator the latter appearelevation, the cap having been removed.

Referring more particularly to Fig. 1, the timing regulator is carried by the small conical-ended shaft 0, commonly used in magneto-shaft c;- inaccuracy of alinement being compensated for by slight play between the claws k and the projections n.

Space is economized seeing thatthe entire ing in vertical section; and Fig. 2 is an end apparatus is inclosed within the fiat casing h. This casing 71. is rotatably mounted on the bearing Z formed upon the part 2,,- the latter being formed with a central recess an adapted to receive the end 0 of the magnetoshaft. 7

To produce the advance of the part ,2, which is fast upon the shaft 0, in relation to the casing h which is rigidly connected to the motor-shaft m, centrifugal bodies p are employed which, in the example given, are provided with teeth which mesh, as shown in Fig. 2 with teeth formed upon the part 2, and also with toothed racks arranged upon the interior of the casing h. It will be understood that, with the movement of the centrifugal bodies p, their toothed portions impart movement both' to the central pinion and to the internally toothed surrounding casing thus thereby effecting a larger angular displacement than if the centrifugal bodies 12 were-pivoted on fixed bearings and engaged with a single tooth-gear, as has already been prop i The eobject of thepresent invention'is, however, not limited to the employment of ,fly-wei hts or levers as described, as any shaft maybe pivoted. It isimportant, however, that each of the parts to be turned relatively to eachother forms the bearing of the. other part.

In .cases -where the inductor is not driven directly by the motor shaft m butby means of a gearing, the casing h is preferably provided'with a tooth-wheel gearing 2 to engage with directly.

Preferably the part 2 forms the protecting case of the apparatus but if desired the part a, may be easily used for this purpose.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be. performed,I claim v 1. In mechanism of the class described, in combination, a motor shaft, a magneto shaft,

two connected parts concentrically rotatable relatively to each other, means for attaching one of said parts concentrically to. one of said shafts, said parts being so arranged that both of said parts will be intersected by a single plane at right angles to the axis of said one of said shafts and so arranged that' each of said parts presents a bearing surface for the other, and connecting means between said two arts which automatically varies their relative angular position depending upon the speed of rotation of said one of said shafts.

- 2. In mechanism of the classdescribed, in

combination, a motor shaft, 2. magneto shaft,

two connecting parts concentrically rotatable relatively to each other and so arranged that one of said parts is loosely sleeved directly upon the other, means for attaching one of said parts concentrically to one of one of said parts concentrically to one of said shafts, and connecting means between said two parts which automatically varies their relative angular position depending upon the speed of rotation of said one of ,said shafts, said connecting means including an external gear on one of said parts, an internal gear on the other, and a centrifugal body pivoted in one of said parts and bearing a gear adjacent its pivot in intermediate mesh with both of the other gears. 4. In mechanism of the class described, in combination, a motor shaft, a magneto shaft, a hub mounted upon one of said shafts, an external gear on the hub, a hollow member centrifugally and rotatably arranged on said hub and inclosing said'external gear, an internal gear within said member concentric with the external gear, and a centrifugal body pivoted in said member and bearing a gear adjace'nt its pivot in intermediate, mesh With both of the other gears. In testimony whereof I have aflixed my signature in presence of two witnesses.

HERMANN DIEHL.

' Witnesses:

JEAN GRUND, CARL GRUND. 

